Thermo Scientific Thermolyne NCAT F85930, Installation And Operation Manual

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14
Hidden Key Routines
58 NCAT Asphalt Content Tester Thermo Scientific
3 Key-Chamber Calibration Procedure:
4 Key-Provides Entry to Balance Menus:
Equipment Needed: 1 ea. Digital Pyrometer with Penetration Probe, Sensor NIST Traceable.
(PM20700 Pyrometer with TC405X4 Penetration Probe).
Setup: Calibration consists of inserting a sensor penetrating through the covered
stainless steel tube located adjacently to the control thermocouple. Entry is
at the top center rear of furnace. The penetrating probe is needed to
penetrate through the soft insulation. Probe insertion is at the same depth
of the chamber control thermocouple. Cover probe entry tube after the
calibration procedure has been completed. Do not place pyrometer on top
of hot furnace. After inserting the test thermocouple penetration probe, set
furnace chamber and filter at 538°C or standard method specified
temperature.
Allow furnace to stabilize at setpoint in the idle mode. The maximum offset
allowed before calibration is required is ± 50°C.
Access: Depress the 3 key while simultaneously depressing Power Switch to “ON”.
Procedure: CHBR CAL will be displayed in the Percent Loss and Elapsed Time
windows respectively. The Chamber Temperature window will display the
actual chamber temperature which should be at or near setpoint
temperature. Allow the furnace to stabilize at setpoint.
Enter the temperature displayed in °C by the digital pyrometer by using the
keypad. Press “ENTER”. The new offset value will be used and the entered
temperature will be displayed. The entered temperature is the temporary
setpoint.
The original setpoint will return upon exiting. The software has calculated
and saved the new offset value which will apply to all setpoints throughout
the operating range.
Exit: Depress Power Switch to “OFF” and then “ON” to return furnace to
normal use. Remove sensor probe and cover entry tube.
Access: Depress the 4 key while simultaneously depressing Power Switch to “ON”.
Procedure: BAL will display in Chamber Temperature window. CAL will display in
Percent Loss window. Entry allows user to change time and date settings,
review and adjust balance inputs, and calibrate balance. These topics are
detailed under the “Balance Calibration” instructions. (See
“The Balance
Default Settings When Used in the Type F85900 NCAT Furnace:” on
page 25 .)
Exit: Depress Power Switch “OFF” and then “ON” to return furnace to normal
use.